Thumb protector



FIG. 1 is a perspective view of my design;

FIG. 2 is a front elevational view of my design;

FIG. 3 is a back elevational view of my design;

FIG. 4 is a left side elevational view of my design;

FIG. 5 is a right side elevational view of my design;

FIG. 6 is a top view of my design; and,

FIG. 7 is a bottom view of my design.

The features shown in broken lines in FIG. 1 are shown for illustrative purpose only and form no part of the claimed design. 

The ornamental design for a thumb protector, as shown and described. 